DRILL DIAMETERS FOR THREAD RECOMMENDATION TABLES
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WHITWORTH COARSE THREAD
Tap BSW |
Number of t.p.i. |
Max Interal Diameter mm |
Drill Diameter mm |
3/32 |
48 |
1.91 |
1.85 |
1/8 |
40 |
2.59 |
2.55 |
5/32 |
32 |
3.211 |
3.2 |
3/16 |
24 |
3.744 |
3.7 |
7/32 |
24 |
4.538 |
4.5 |
1/4 |
20 |
5.224 |
5.1 |
5/16 |
18 |
6.661 |
6.5 |
3/8 |
16 |
8.052 |
7.9 |
7/16 |
14 |
9.379 |
9.2 |
1/2 |
12 |
10.61 |
10.5 |
9/16 |
12 |
12.176 |
12 |
5/8 |
11 |
13.598 |
13.5 |
3/4 |
10 |
16.538 |
16.5 |
7/8 |
9 |
19.411 |
19.25 |
1 |
8 |
22.185 |
22 |
1.1/8 |
7 |
24.879 |
24.75 |
1.1/4 |
7 |
28.054 |
28 |
1.3/8 |
6 |
30.555 |
30.5 |
1.1/2 |
6 |
33.73 |
33.5 |
1.5/8 |
5 |
35.912 |
35.5 |
1.3/4 |
5 |
39.098 |
39 |
1.7/8 |
4.1/2 |
41.648 |
41.5 |
2 |
4.1/2 |
44.823 |
44.5 | |